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0.0
Jun 29, 2018
06/18
by
Tobias Fromm; Andreas Birk
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eye 0
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We present a damage-aware planning approach which determines the best sequence to manipulate a number of objects in a scene. This works on task-planning level, abstracts from motion planning and anticipates the dynamics of the scene using a physics simulation. Instead of avoiding interaction with the environment, we take unintended motion of other objects into account and plan manipulation sequences which minimize the potential damage. Our method can also be used as a validation measure to...
Topics: Computing Research Repository, Robotics
Source: http://arxiv.org/abs/1603.00652
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62
Sep 21, 2013
09/13
by
Tobias Hartnick; Andreas Ott
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eye 62
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We prove surjectivity of the comparison map from continuous bounded cohomology to continuous cohomology for Hermitian Lie groups with finite center. For general semisimple Lie groups with finite center, the same argument shows that the image of the comparison map contains all the even generators. Our proof uses a Hirzebruch type proportionality principle in combination with Gromov's results on boundedness of primary characteristic classes and classical results of Cartan and Borel on the...
Source: http://arxiv.org/abs/0905.3395v2
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1.0
Jun 29, 2018
06/18
by
Tobias Morciniec; Andreas Podelski
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eye 1
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During the execution of a test plan, a test manager may decide to drop a test case if its result can be inferred from already executed test cases. We show that it is possible to automatically generate a test plan to exploit the potential to justifiably drop a test case and thus reduce the number of test cases. Our approach uses Boolean formulas to model the mutual dependencies between test results. The algorithm to generate a test plan comes with the formal guarantee of optimality with regards...
Topics: Software Engineering, Computing Research Repository
Source: http://arxiv.org/abs/1612.04351
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Sep 23, 2013
09/13
by
Tobias Hartnick; Andreas Ott
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eye 44
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We explain how the generalized Milnor-Wood inequality of Burger and Iozzi for reductive representations of a cocompact complex-hyperbolic lattice into a Hermitian Lie group translates under Simpson's non-abelian Hodge correspondence into an inequality for topological invariants of the corresponding Higgs bundles. In this way, we obtain an inequality that holds for all Hermitian Lie groups, generalizing the Milnor-Wood type inequalities for Higgs bundles that have been proved for the classical...
Source: http://arxiv.org/abs/1105.4323v1
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0.0
Jun 29, 2018
06/18
by
Tobias Hartnick; Andreas Ott
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eye 0
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comment 0
We analyze existence, uniqueness and regularity of solutions for perturbations of the Spence-Abel equation for the Rogers' dilogarithm. As an application we deduce a version of Hyers-Ulam stability for the Spence-Abel equation. Our analysis makes use of a well-known cohomological interpretation of the Spence-Abel equation and is based on our recent results on continuous bounded cohomology of SL(2,R).
Topics: Number Theory, Group Theory, Classical Analysis and ODEs, Mathematics
Source: http://arxiv.org/abs/1601.07109
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Oct 28, 2014
10/14
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Gluck, Tobias M; Maercker, Andreas
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This article is from BMC Psychiatry , volume 11 . Abstract Background: Mindfulness has been shown to be effective in treating various medical and mental problems. Especially its incorporation in cognitive-behavioural interventions has improved long-term outcomes of those treatments. It has also been shown, that brief mindfulness-based trainings are effective in reducing distress. There have been few web-based interventions incorporating mindfulness techniques in their manual and it remains...
Source: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3250944
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Sep 20, 2013
09/13
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Tobias Zingg; Andreas Aste; Dirk Trautmann
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Solutions of the stationary axisymmetric Einstein equations describing the interior of circularly rotating dust are investigated in order to study their potential applicability as galaxy models. It is shown that such interior solutions cannot be used as global metrics without becoming unphysical in certain regions of space. Although definite results concerning the non-existence of a continuation into a vacuum can only be derived for interior solutions describing rigidly rotating dust, the...
Source: http://arxiv.org/abs/astro-ph/0608299v1
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0.0
Jun 28, 2018
06/18
by
Tobias Hellwig; Andreas Wipf; Omar Zanusso
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We study the renormalization group flow of $\mathbb{Z}_2$-invariant supersymmetric and non-supersymmetric scalar models in the local potential approximation using functional renormalization group methods. We focus our attention to the fixed points of the renormalization group flow of these models, which emerge as scaling solutions. In two dimensions these solutions are interpreted as the minimal (supersymmetric) models of conformal field theory, while in three dimension they are manifestations...
Topics: Statistical Mechanics, Condensed Matter, High Energy Physics - Theory
Source: http://arxiv.org/abs/1508.02547
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Sep 18, 2013
09/13
by
Thomas Heinzl; Tobias Kaestner; Andreas Wipf
texts
eye 42
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We compare different Polyakov loop actions yielding effective descriptions of finite-temperature SU(2) Yang-Mills theory on the lattice. The actions are motivated by a simultaneous strong-coupling and character expansion obeying center symmetry and include both Ising and Ginzburg-Landau type models. To keep things simple we limit ourselves to nearest-neighbor interactions. Some truncations involving the most relevant characters are studied within a novel mean-field approximation. Using inverse...
Source: http://arxiv.org/abs/hep-lat/0502013v2
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0.0
Jun 26, 2018
06/18
by
Tobias Melson; Hans-Thomas Janka; Andreas Marek
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We present the first successful simulation of a neutrino-driven supernova explosion in three dimensions (3D), using the Prometheus-Vertex code with an axis-free Yin-Yang grid and a sophisticated treatment of three-flavor, energy-dependent neutrino transport. The progenitor is a nonrotating, zero-metallicity 9.6 Msun star with an iron core. While in spherical symmetry outward shock acceleration sets in later than 300 ms after bounce, a successful explosion starts at ~130 ms postbounce in two...
Topics: High Energy Astrophysical Phenomena, Astrophysics, Nuclear Theory, Solar and Stellar Astrophysics
Source: http://arxiv.org/abs/1501.01961
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Jul 20, 2013
07/13
by
Tobias Geiger; Thomas Wellens; Andreas Buchleitner
texts
eye 87
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We develop a diagrammatic scattering theory for interacting bosons in a three-dimensional, weakly disordered potential. We show how collisional energy transfer between the bosons induces the thermalization of the inelastic single-particle current which, after only few collision events, dominates over the elastic contribution described by the Gross-Pitaevskii ansatz.
Source: http://arxiv.org/abs/1203.1722v3
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0.0
Jun 29, 2018
06/18
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Tobias Fritz; Tim Netzer; Andreas Thom
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Containment problems for polytopes and spectrahedra appear in various applications, such as linear and semidefinite programming, combinatorics, convexity and stability analysis of differential equations. This paper explores the theoretical background of a method proposed by Ben-Tal and Nemirovksi. Their method provides a strengthening of the containment problem, that is algorithmically well tractable. To analyze this method, we study abstract operator systems, and investigate when they have a...
Topics: Functional Analysis, Algebraic Geometry, Mathematics
Source: http://arxiv.org/abs/1609.07908
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Sep 22, 2013
09/13
by
Reinhold Bien; Tobias Brandt; Andreas Just
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SUPERBOX-10 is the successor of SUPERBOX, a particle-mesh code where additional grids and sub-grids are applied to regions of high particle density. Previous limitations have been solved. For instance, the vertical resolution is improved considerably when flattened grids are used. Since the computationally most intensive part is the Fast Fourier Transform, we introduce a parallelised version using the library FFTW, resulting in a speed-up of a few. The new features are tested using a galaxy...
Source: http://arxiv.org/abs/1210.1736v1
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Sep 20, 2013
09/13
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Tobias Fritz; Tim Netzer; Andreas Thom
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eye 36
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In this note we address various algorithmic problems that arise in the computation of the operator norm in unitary representations of a group on Hilbert space. We show that the operator norm in the universal unitary representation is computable if the group is residually finite-dimensional or amenable with decidable word problem. Moreover, we relate the computability of the operator norm on the product of non-abelian free groups to Kirchberg's QWEP Conjecture, a fundamental open problem in the...
Source: http://arxiv.org/abs/1207.0975v2
Preceded by two dedicatory epistles, on in English verse, the other in Latin prose, and by an English letter from Andreas Hesslius to the author. The map is chiefly of eastern Pennsylvania, Maryland and New Jersey
Topics: Lutheran Church in America, Swedes
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Oct 23, 2014
10/14
by
Hoch, Tobias; Pischetsrieder, Monika; Hess, Andreas
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This article is from Frontiers in Psychology , volume 5 . Abstract Snack food like potato chips substantially contributes to energy intake in humans. In contrast to basic food, snacks are consumed additionally to other meals and may thereby lead to non-homeostatic energy intake. Snack food is also frequently associated with hedonic hyperphagia, a food intake independent from hunger. Analysis of brain activity patterns by manganese-enhanced MRI has previously revealed that the intake of potato...
Source: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3978285
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Sep 23, 2013
09/13
by
Thomas Heinzl; Tobias Kaestner; Andreas Wipf
texts
eye 26
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We determine effective lattice actions for the Polyakov loop using inverse Monte Carlo techniques.
Source: http://arxiv.org/abs/hep-lat/0511019v1
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Sep 18, 2013
09/13
by
Tobias Hartnick; Ralf Köhl; Andreas Mars
texts
eye 32
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We prove that a two-spherical split Kac-Moody group over a local field naturally provides a topological twin building in the sense of Kramer. This existence result and the local-to-global principle for twin building topologies combined with the theory of Moufang foundations as introduced and studied by M\"uhlherr, Ronan, and Tits allows one to immediately obtain a classification of two-spherical split Moufang topological twin buildings whose underlying Coxeter diagram contains no loop and...
Source: http://arxiv.org/abs/1201.3562v2
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0.0
Jun 29, 2018
06/18
by
Tobias Fromm; Christian A. Mueller; Andreas Birk
texts
eye 0
favorite 0
comment 0
We present a framework to generate watertight mesh representations in an unsupervised manner from noisy point clouds of complex, heterogeneous objects with free-form surfaces. The resulting meshes are ready to use in applications like kinematics and dynamics simulation where watertightness and fast processing are the main quality criteria. This works with no necessity of user interaction, mainly by utilizing a modified Growing Neural Gas technique for surface reconstruction combined with...
Topics: Computing Research Repository, Robotics
Source: http://arxiv.org/abs/1603.00663
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0.0
Jun 30, 2018
06/18
by
Christian Frey; Andreas Züfle; Tobias Emrich; Matthias Renz
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comment 0
Reliable propagation of information through large networks, e.g. communication networks, social networks or sensor networks is very important in many applications concerning marketing, social networks, and wireless sensor networks. However, social ties of friendship may be obsolete, and communication links may fail, inducing the notion of uncertainty in such networks. In this paper, we address the problem of optimizing information propagation in uncertain networks given a constrained budget of...
Topics: Physics, Data Structures and Algorithms, Computing Research Repository, Social and Information...
Source: http://arxiv.org/abs/1701.05395
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Sep 20, 2013
09/13
by
Tobias Zech; Roberto Mulet; Thomas Wellens; Andreas Buchleitner
texts
eye 31
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For more than 50 years we have known that photosynthetic systems harvest solar energy with almost unit {\it quantum efficiency}. However, recent experimental evidence of {\it quantum coherence} during the excitonic energy transport in photosynthetic organisms challenges our understanding of this fundamental biological function. Currently, and despite numerous efforts, the causal connection between coherence and efficiency is still a matter of debate. We show, through the study of extensive...
Source: http://arxiv.org/abs/1205.5519v1
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Sep 18, 2013
09/13
by
Christian Wozar; Tobias Kaestner; Andreas Wipf; Thomas Heinzl
texts
eye 45
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This paper concludes our efforts in describing SU(3)-Yang-Mills theories at different couplings/temperatures in terms of effective Polyakov-loop models. The associated effective couplings are determined through an inverse Monte Carlo procedure based on novel Schwinger-Dyson equations that employ the symmetries of the Haar measure. Due to the first-order nature of the phase transition we encounter a fine-tuning problem in reproducing the correct behavior of the Polyakov-loop from the effective...
Source: http://arxiv.org/abs/0704.2570v1
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0.0
Jun 29, 2018
06/18
by
Andreas Ammon; Tobias Hartung; Karl Jansen; Hernan Leövey; Julia Volmer
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In lattice Quantum Field Theory, we are often presented with integrals over polynomials of coefficients of matrices in U(N) or SU(N) with respect to the Haar measure. In some physical situations, e.g., in presence of a chemical potential, these integrals are numerically very difficult since their integrands are highly oscillatory which manifests itself in form of the sign problem. In these cases, Monte Carlo methods often fail to be adequate, rendering such computations practically impossible....
Topic: High Energy Physics - Lattice
Source: http://arxiv.org/abs/1610.01931
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Jul 19, 2013
07/13
by
Luigi Amico; Holger Frahm; Andreas Osterloh; Tobias Wirth
texts
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We formulate the functional Bethe ansatz for bosonic (infinite dimensional) representations of the Yang-Baxter algebra. The main deviation from the standard approach consists in a half infinite 'Sklyanin lattice' made of the eigenvalues of the operator zeros of the Bethe annihilation operator. By a separation of variables, functional TQ equations are obtained for this half infinite lattice. They provide valuable information about the spectrum of a given Hamiltonian model. We apply this...
Source: http://arxiv.org/abs/1005.5681v3
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Sep 18, 2013
09/13
by
Georg Bergner; Tobias Kaestner; Sebastian Uhlmann; Andreas Wipf
texts
eye 23
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We study and simulate N=2 supersymmetric Wess-Zumino models in one and two dimensions. For any choice of the lattice derivative, the theories can be made manifestly supersymmetric by adding appropriate improvement terms corresponding to discretizations of surface integrals. In one dimension, our simulations show that a model with the Wilson derivative and the Stratonovitch prescription for this discretization leads to far better results at finite lattice spacing than other models with Wilson...
Source: http://arxiv.org/abs/0705.2212v2
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Sep 23, 2013
09/13
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Ralph Neuhaeuser; Markus Mugrauer; Andreas Seifahrt; Tobias Schmidt; Nikolaus Vogt
texts
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Neuhaeuser et al. (2005) presented direct imaging evidence for a sub-stellar companion to the young T Tauri star GQ Lup. Common proper motion was highly significant, but no orbital motion was detected. Faint luminosity, low gravity, and a late-M/early-L spectral type indicated that the companion is either a planet or a brown dwarf. We have monitored GQ Lup and its companion in order to detect orbital and parallactic motion and variability in its brightness. We also search for closer and fainter...
Source: http://arxiv.org/abs/0801.2287v1
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Sep 18, 2013
09/13
by
Andreas Dewes; Tobias Gaber; Dieter Koelle; Reinhold Kleiner; Edward Goldobin
texts
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Josephson junctions with a phase drop pi in the ground state allow to create vortices of supercurrent carrying only half of the magnetic flux quantum Phi_0~2.07*10^-15 Wb. Such semifluxons have two-fold degenerate ground states denoted up (with flux +Phi_0/2 and supercurrent circulating clockwise) and down (with flux -Phi_0/2 and supercurrent circulating counterclockwise). We investigate a molecule consisting of two coupled semifluxons in a 0-pi-0 long Josephson junction. The fluxes...
Source: http://arxiv.org/abs/0809.1346v1
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Sep 22, 2013
09/13
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Fernando Peruani; Tobias Klauss; Andreas Deutsch; Anja Voss-Boehme
texts
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We study a simple swarming model on a two-dimensional lattice where the self-propelled particles exhibit a tendency to align ferromagnetically. Volume exclusion effects are present: particles can only hop to a neighboring node if the node is empty. Here we show that such effects lead to a surprisingly rich variety of self-organized spatial patterns. As particles exhibit an increasingly higher tendency to align to neighbors, they first self-segregate into disordered particle aggregates....
Source: http://arxiv.org/abs/1302.3797v1
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Oct 23, 2014
10/14
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Mupepele, Anne-Christine; Muller, Tobias; Dittrich, Marcus; Floren, Andreas
texts
eye 33
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This article is from PLoS ONE , volume 9 . Abstract Arboreal spiders in deciduous and coniferous trees were investigated on their distribution and diversity. Insecticidal knock-down was used to comprehensively sample spiders from 175 trees from 2001 to 2003 in the Białowieża forest and three remote forests in Poland. We identified 140 species from 9273 adult spiders. Spider communities were distinguished between deciduous and coniferous trees. The richest fauna was collected from Quercus...
Source: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3930551
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Jun 30, 2018
06/18
by
Janek Thomas; Tobias Hepp; Andreas Mayr; Bernd Bischl
texts
eye 0
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We present a new variable selection method based on model-based gradient boosting and randomly permuted variables. Model-based boosting is a tool to fit a statistical model while performing variable selection at the same time. A drawback of the fitting lies in the need of multiple model fits on slightly altered data (e.g. cross-validation or bootstrap) to find the optimal number of boosting iterations and prevent overfitting. In our proposed approach, we augment the data set with randomly...
Topics: Machine Learning, Statistics, Computation
Source: http://arxiv.org/abs/1702.04561
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Jun 28, 2018
06/18
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Andreas Maser; Benjamin Gmeiner; Tobias Utikal; Stephan Götzinger; Vahid Sandoghdar
texts
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The pioneering experiments of linear spectroscopy were performed using flames in the 1800s, but nonlinear optical measurements had to wait until lasers became available in the twentieth century. Because the nonlinear cross section of materials is very small, usually macroscopic bulk samples and pulsed lasers are used. Numerous efforts have explored coherent nonlinear signal generation from individual nanoparticles or small atomic ensembles with millions of atoms. Experiments on a single...
Topics: Quantum Physics, Optics, Physics
Source: http://arxiv.org/abs/1509.05216
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Sep 18, 2013
09/13
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Tobias Bruenner; Erich Runge; Andreas Buchleitner; Vivian V. Franca
texts
eye 25
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We investigate the effects of spatial inhomogeneities on the entanglement of modes of strongly correlated systems in the framework of small Fermi-Hubbard chains. We find regimes where entanglement is strongly enhanced by the presence of inhomogeneities. This contrasts recent reports of entanglement destruction due to inhomogeneities. We further study this phenomenon using concepts of Density Functional Theory and, thus, provide a general recipe for the prediction of entanglement enhancement in...
Source: http://arxiv.org/abs/1209.3268v2
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Sep 19, 2013
09/13
by
Andreas Wipf; Thomas Heinzl; Tobias Kaestner; Christian Wozar
texts
eye 29
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We study the Polyakov loop dynamics originating from finite-temperature Yang-Mills theory. The effective actions contain center-symmetric terms involving powers of the Polyakov loop, each with its own coupling. For a subclass with two couplings we perform a detailed analysis of the statistical mechanics involved. To this end we employ a modified mean field approximation and Monte Carlo simulations based on a novel cluster algorithm. We find excellent agreement of both approaches. The phase...
Source: http://arxiv.org/abs/hep-lat/0610043v2
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Sep 18, 2013
09/13
by
Christian Wozar; Georg Bergner; Tobias Kaestner; Sebastian Uhlmann; Andreas Wipf
texts
eye 38
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We study lattice formulations of the two-dimensional N=2 Wess-Zumino model with a cubic superpotential. Discretizations with and without lattice supersymmetries are compared. We observe that the "Nicolai improvement" introduces new problems to simulations of the supersymmetric model. With high statistics we check the degeneracy of bosonic and fermionic masses on the lattice. Perturbative mass corrections to one-loop order are compared with continuum extrapolations of our lattice...
Source: http://arxiv.org/abs/0809.2176v1
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Sep 18, 2013
09/13
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Christian Wozar; Tobias Kaestner; Andreas Wipf; Thomas Heinzl; Balazs Pozsgay
texts
eye 28
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We study effective lattice actions describing the Polyakov loop dynamics originating from finite-temperature Yang-Mills theory. Starting with a strong-coupling expansion the effective action is obtained as a series of Z(3)-invariant operators involving higher and higher powers of the Polyakov loop, each with its own coupling. Truncating to a subclass with two couplings we perform a detailed analysis of the statistical mechanics involved. To this end we employ a modified mean field approximation...
Source: http://arxiv.org/abs/hep-lat/0605012v1
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0.0
Jun 30, 2018
06/18
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Marianne Heilmann; Tobias Hellwig; Benjamin Knorr; Marcus Ansorg; Andreas Wipf
texts
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We confirm the convergence of the derivative expansion in two supersymmetric models via the functional renormalization group method. Using pseudo-spectral methods, high-accuracy results for the lowest energies in supersymmetric quantum mechanics and a detailed description of the supersymmetric analogue of the Wilson-Fisher fixed point of the three-dimensional Wess-Zumino model are obtained. The superscaling relation proposed earlier, relating the relevant critical exponent to the anomalous...
Topic: High Energy Physics - Theory
Source: http://arxiv.org/abs/1409.5650
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Jul 24, 2013
07/13
by
Tobias Kaestner; Georg Bergner; Sebastian Uhlmann; Andreas Wipf; Christian Wozar
texts
eye 40
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We consider the two-dimensional N=(2,2) Wess-Zumino model with a cubic superpotential at weak and intermediate couplings. Refined algorithms allow for the extraction of reliable masses in a region where perturbation theory no longer applies. We scrutinize the Nicolai improvement program which is supposed to guarantee lattice supersymmetry and compare the results for ordinary and non-standard Wilson fermions with those for SLAC derivatives. It turns out that this improvement completely fails to...
Source: http://arxiv.org/abs/0807.1905v1
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Oct 17, 2014
10/14
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Renkawitz, Tobias; Niemeier, Andreas; von Knoch, Fabian; Biedermann, Rainer
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This article is from Orthopedic Reviews , volume 6 . Abstract None
Source: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4083315
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Sep 21, 2013
09/13
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Andreas Scholz; Tobias Dollinger; Paul Wenk; Klaus Richter; John Schliemann
texts
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We study the dynamical dielectric function of a two-dimensional hole gas, exemplified on [001]-GaAs and InAs quantum wells, within the Luttinger model extended to the two lowest subbands including bulk and structure inversion asymmetric terms. The plasmon dispersion shows a pronounced anisotropy for GaAs- and InAs-based systems. In GaAs this leads to a suppression of plasmons due to Landau damping in some orientations. Due to the large Rashba contribution in InAs, the lifetime of plasmons can...
Source: http://arxiv.org/abs/1301.6578v2
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Sep 21, 2013
09/13
by
Tobias Kaestner; Georg Bergner; Sebastian Uhlmann; Andreas Wipf; Christian Wozar
texts
eye 39
favorite 0
comment 0
We study and simulate N=2 supersymmetric Wess-Zumino models in one and two dimensions. For any choice of the lattice derivative, the theories can be made manifestly supersymmetric by adding appropriate improvement terms corresponding to discretizations of surface integrals. In particular, we check that fermionic and bosonic masses coincide and the unbroken Ward identities are fulfilled to high accuracy. Equally good results for the effective masses can be obtained in a model with the SLAC...
Source: http://arxiv.org/abs/0709.0822v2
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0.0
Jun 29, 2018
06/18
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Tobias Morawietz; Andreas Singraber; Christoph Dellago; Jörg Behler
texts
eye 0
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While the interactions between water molecules are dominated by strongly directional hydrogen bonds (HBs), it was recently proposed that relatively weak, isotropic van der Waals (vdW) forces are essential for understanding the properties of liquid water and ice. This insight was derived from ab initio computer simulations, which provide an unbiased description of water at the atomic level and yield information on the underlying molecular forces. However, the high computational cost of such...
Topics: Computational Physics, Other Condensed Matter, Statistical Mechanics, Condensed Matter, Physics,...
Source: http://arxiv.org/abs/1606.07775
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Sep 19, 2013
09/13
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Christian Wozar; Tobias Kaestner; Sebastian Uhlmann; Andreas Wipf; Thomas Heinzl
texts
eye 42
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comment 0
We study effective Polyakov loop models for SU(3) Yang-Mills theory at finite temperature. A comprehensive mean field analysis of the phase diagram is carried out and compared to the results obtained from Monte-Carlo simulations. We find a rich phase structure including ferromagnetic and antiferromagnetic phases. Due to the presence of a tricritical point the mean field approximation agrees very well with the numerical data. Critical exponents associated with second-order transitions coincide...
Source: http://arxiv.org/abs/0708.4146v1
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Jul 20, 2013
07/13
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Tobias Henz; Jan Martin Pawlowski; Andreas Rodigast; Christof Wetterich
texts
eye 66
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We propose a simple fixed point scenario in the renormalization flow of a scalar dilaton coupled to gravity. This would render gravity non-perturbatively renormalizable and thus constitute a viable theory of quantum gravity. On the fixed point dilatation symmetry is exact and the quantum effective action takes a very simple form. Realistic gravity with a nonzero Planck mass is obtained through a nonzero expectation value for the scalar field, constituting a spontaneous scale symmetry breaking....
Source: http://arxiv.org/abs/1304.7743v1
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Jul 20, 2013
07/13
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Ralf Metzler; Tobias Ambjoernsson; Andreas Hanke; Yongli Zhang; Stephen Levene
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From a nanoscience perspective, cellular processes and their reduced in vitro imitations provide extraordinary examples for highly robust few or single molecule reaction pathways. A prime example are biochemical reactions involving DNA molecules, and the coupling of these reactions to the physical conformations of DNA. In this review, we summarise recent results on the following phenomena: We investigate the biophysical properties of DNA-looping and the equilibrium configurations of DNA-knots,...
Source: http://arxiv.org/abs/physics/0609139v2
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Sep 23, 2013
09/13
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Romain Terazzi; Tobias Gresch; Andreas Wittmann; Jérôme Faist
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A model of sequential resonant tunneling transport between two-dimensional subbands that takes into account explicitly elastic scattering is investigated. It is compared to transport measurements performed on quantum cascade lasers where resonant tunneling processes are known to be dominating. Excellent agreement is found between experiment and theory over a large range of current, temperature and device structures.
Source: http://arxiv.org/abs/0810.0146v1
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Sep 17, 2013
09/13
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Vyacheslav Shatokhin; Tobias Geiger; Thomas Wellens; Andreas Buchleitner
texts
eye 31
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This paper analyzes coherent backscattering of intense laser light by two randomly placed distant atoms. Starting from the general two-atom master equation, we analytically derive the elastic and inelastic background and interference components of the double scattering spectrum. By expressing the final results in terms of single-atom observables, the two-atom problem is shown to be equivalent to a description in terms of single atoms under bichromatic driving.
Source: http://arxiv.org/abs/1003.6122v1
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Sep 24, 2013
09/13
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John F. Donoghue; Barry R. Holstein; Tobias Huber; Andreas Ross
texts
eye 19
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We discuss the calculation of the strange magnetic radius of the proton in chiral perturbation theory. In particular we investigate the low energy component of the loop integrals involving kaons. We separate the chiral calculation into a low energy part and a high energy component through use of a momentum space separation scale. This separation shows that most of the chiral calculation comes from high energies where the effective field theory treatment is not valid. The resulting low energy...
Source: http://arxiv.org/abs/hep-ph/0412035v1
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Sep 19, 2013
09/13
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Thomas Wellens; Tobias Geiger; Vyacheslav Shatokhin; Andreas Buchleitner
texts
eye 37
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We deduce the coherent backscattering signal from two distant laser-driven atoms using single-atom equations. In contrast to the standard master equation treatment, this new approach is suitable for the generalization to a large number of atomic scatterers.
Source: http://arxiv.org/abs/0909.5607v1
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Sep 20, 2013
09/13
by
Henning Kaufer; Andreas Sawadsky; Tobias Westphal; Daniel Friedrich; Roman Schnabel
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The quantum state of light changes its nature when being reflected off a mechanical oscillator due to the latter's susceptibility to radiation pressure. As a result, a coherent state can transform into a squeezed state and can get entangled with the motion of the oscillator. The complete tomographic reconstruction of the state of light requires the ability to readout arbitrary quadratures. Here we demonstrate such a readout by applying a balanced homodyne detector to an interferometric position...
Source: http://arxiv.org/abs/1205.2241v1
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Oct 26, 2014
10/14
by
Morawe, Tobias; Honemann-Capito, Mona; von Stein, Walter; Wodarz, Andreas
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This article is from The Journal of Cell Biology , volume 193 . Abstract Rings lost fulfills a novel function in Drosophila development for a ubiquitin receptor as an essential mediator of ring canal growth during oogenesis.
Source: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3082182
